Thermodynamics and Heat CDS Questions

CDS Physics

Thermodynamics and Heat MCQ Questions


7.
Which common laboratory/clinical instrument is specifically used to measure the temperature of the human body, typically over a narrow range (such as 35°C to 42°C)?
A.
Barometer
B.
Hygrometer
C.
Clinical (medical) thermometer
D.
Pyrometer
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ANSWER :
C. Clinical (medical) thermometer
8.
Which instrument is specifically designed to measure very high temperatures, such as those found in furnaces or molten metal, where contact-based thermometers would be impractical or damaged?
A.
Pyrometer
B.
Anemometer
C.
Barometer
D.
Clinical thermometer
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ANSWER :
A. Pyrometer
9.
A typical mercury-in-glass thermometer relies on which physical property of mercury for its functioning?
A.
Electrical conductivity
B.
Radioactive decay
C.
Magnetic properties
D.
Thermal expansion (mercury expands or contracts measurably with changes in temperature)
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ANSWER :
D. Thermal expansion (mercury expands or contracts measurably with changes in temperature)
10.
Why is mercury traditionally preferred over many other liquids for use in thermometers?
A.
It has a fairly uniform rate of thermal expansion, does not wet glass, and remains liquid over a wide temperature range
B.
It has the highest possible boiling point of any known substance
C.
It is the cheapest liquid available for industrial use
D.
It changes colour distinctly at different temperatures
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ANSWER :
A. It has a fairly uniform rate of thermal expansion, does not wet glass, and remains liquid over a wide temperature range
11.
Why is alcohol sometimes used instead of mercury in thermometers designed for very cold climates or extremely low-temperature measurements?
A.
Alcohol is a better electrical conductor than mercury
B.
Alcohol is heavier than mercury
C.
Alcohol expands less than mercury with temperature changes
D.
Alcohol has a much lower freezing point than mercury, allowing it to remain liquid at extremely cold temperatures
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ANSWER :
D. Alcohol has a much lower freezing point than mercury, allowing it to remain liquid at extremely cold temperatures
12.
Heat is best defined, in physics, as:
A.
Identical in all respects to temperature
B.
A physical substance with measurable mass that can be stored indefinitely
C.
A form of energy that flows from a body at higher temperature to a body at lower temperature, when they are in thermal contact
D.
A force that acts exclusively between charged particles
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ANSWER :
C. A form of energy that flows from a body at higher temperature to a body at lower temperature, when they are in thermal contact